CSE 461: Computer Networks Kurtis Heimerl – kheimerl@cs Matt Johnson – matt9j@cs Zetian Chen – zetiac@cs Chenyang Fang – chenyf@cs Josh Curtis – curtijd@cs
Who we are
ICTD • Information and Communication Technology for Development • Development -> Poverty Alleviation (not software development) • Broad field covering health, justice, and access • Why? • Lots of natural intuition from Alaska, I know rural. • Able to use networking skill -> Many opportunities (NSRC) • My subfield: Cellular access • My Answer: Community Cellular
TAs Now!
Matt J. ⚫ From Houston, TX, USA ⚫ Grad Student at UW CSE - researching rural networking ⚫ Love reading, photography, and bikes ⚫ Office hours Mondays before class M(11:30-12:30) in CSE2-131
Name : ChenyangFang (Michael) Year : Senior What I like : Music Music and Music Favorite Band: The Stone Roses Favorite Guitarist: John Squire Favorite Professor: Kurtis Heimerl I don’t really have many photos Favorite Town: KurtisTown
➢ I’m a senior CSE undergrad ➢ I also minor in Japanese ➢ I love watching movies ➢ This is my first time TA-ing Devon (Zetian) Chen
Class Structure
Book • Previous years used Computer Networks (5E 12), Peterson • Normal book for normal classes. • We're moving to Computer Networks (6E 19), Peterson • Open source book still in development by same authors • Lots of repeated content • ++ -> It's free and covers new exciting things • -- -> It's buggy and there are no questions
Grading • Reading and Quizzes: 15% • Reading from online book and quizzes per chapter held in section • Covers reading and in-class material • Expect around 6-7 of these This Photoby Unknown author is licensed under CC BY-SA.
Grading • Reading and Quizzes: 15% • 3 Projects: (15 + 15 + 15)% • Socket programming (basic networking) • Link and Network layer behavior (link layer) • HTTP Proxy (application layer) This Photoby Unknown author is licensed under CC BY-NC-ND.
Grading • Reading and Quizzes: 15% • 3 Projects: (15 + 15 + 15)% • Midterm: 15% • Somewhere in the middle of the quarter (was late October last year)
Grading • Reading and Quizzes: 15% • 3 Projects: (15 + 15 + 15)% • Midterm: 15% • Final: 25% • Comprehensive of all content from the class
Grading • Reading and Quizzes: 15% • 3 Projects: (15 + 15 + 15)% • Midterm: 15% • Final: 25% Late Policy: Each person gets three late days. Late days will be decided at end of quarter and selected as to have the most positive impact.
Administrivia • Office hours • Opportunity to have more personal interactions with both me and the TAs. • Tools • Mailing list: primary class communications • Canvas Assignments: Homework and projects • Canvas Discussion: Back and forth discussions on class content • Canvas Gradebook: Grades will be posted here • Slides • Adapted from David Wetherall, his talks are online • I will be posting my own slides right before lecture as well
Laptop Policy • Laptops are fine • If you are going to be on Facebook do it in the back of class • This is distracting to other students • TAs will be enforcing this policy
Questions?
CSE 461: Computer Networks
Focus of the course ???
Focus of the course (in today’s terms) ???
Focus of the course (2) • Three “networking” topics: Distributed systems CSE 452 Networking CSE 461 Communications EE 417
The Main Point 1. To learn the fundamentals of computer networks 2. Learn how the Internet works • What really happens when you “browse the web”? • TCP/IP, DNS, HTTP, NAT, VPNs, 802.11 etc. 3. Understand why the internet is designed how it is designed • SDN, Load Balancers, Architectures
Why learn the Fundamentals? 1. Apply to all computer networks 2. Intellectual interest 3. Change / reinvention
Fundamentals – Intellectual Interest • Example key problem: Reliability! • Any part of the Internet might fail • Messages might be corrupted • So how do we provide reliability? • Reliability solutions • Codes to detect/correct errors • Routing around failures ...
Fundamentals – Intellectual Interest (2) Key problem Example solutions Codes for error detection/correction ( § 3.2, 3.3) Reliability despite Routing around failures ( § 5.2) failures Addressing ( § 5.6) and naming ( § 7.1) Network growth Protocol layering ( § 1.3) and evolution Multiple access ( § 4.2) Allocation of resources Congestion control ( § 5.3, 6.3) like bandwidth Confidentiality of messages ( § 8.2, 8.6) Security against various Authentication of communicating parties ( § 8.7) threats
Fundamentals – Reinvention • The Internet is constantly being re-invented! • Growth over time and technology trends drive upheavals in Internet design and usage • Today’s Internet is different from yesterday’s • Lots of new exciting things (QUIC, SDN, etc) • And tomorrow’s will be different again • But the fundamentals remain the same
Fundamentals – Reinvention (2) • Many billions of Internet hosts and growing … • 5B+ on Cell Networks • 3B+ on Internet
Fundamentals – Reinvention (3) • Examples of upheavals in the past 1-2 decades Change Enabling Technology Emergence of the web Content Distribution Networks Piracy Peer-to-peer file sharing Voice over IP (VoIP) Quality of Service (QoS)* Internet of Things IPv6 Mobile Devices Wireless Networking *mostly actually spare capacity
Fundamentals – Reinvention (4) • Upcoming/Ongoing upheavals? Change Enabling Technology Fake News Social Media No-power devices? Backscatter Generic Networks? SDN Ubiquitous Networks? Satellite/Long-Distance Networks Videos as Comms High-Bandwidth Mobile (4G/5G)
The Main Point 1. To learn the fundamentals of computer networks 2. Learn how the Internet works • What really happens when you “browse the web”? • TCP/IP, DNS, HTTP, NAT, VPNs, 802.11 etc. 3. Understand why the internet is designed how it is designed • SDN, Load Balancers, Architectures
Who cares about the internet? 1. Curiosity 2. Impact on our world 3. Job prospects!
From this experimental network (~1970)… (a) Dec. 1969. (b) July 1970. (c) March 1971.
To this…
To this! (2011)
And this (2015)! • An everyday institution used at work, home, and on-the-go • Visualization contains millions of servers • Red = .com, Yellow= .org • Network now contains literally 3 billion people !
Internet – Societal Impact • An enabler of societal change • ++ -> Easy access to knowledge • ++ -> Electronic commerce • ?? -> Personal relationships • ?? -> Private communications • -- -> Fake News • -- -> Arguing politics on Facebook
Internet – Economic impact • An engine of economic growth • Information sources • And lots of ethical questions! • ++ -> Online marketplaces • ?? -> Social media/Crowdsourcing • -- -> "Gig economy"
The Main Point 1. To learn the fundamentals of computer networks 2. Learn how the Internet works • What really happens when you “browse the web”? • TCP/IP, DNS, HTTP, NAT, VPNs, 802.11 etc. 3. Understand why the internet is designed how it is designed • SDN, Load Balancers, Architectures
Architectures • Lots of ways to build networks with different tradeoffs • Goals: • Open Access (Internet) • Safety--, Security--, Flexibility++, Privacy++ • Identity First (Cellular) • Safety++, Security++, Privacy --, Flexibility-- • Centralized (Comcast) • Complexity++, Freedom-- • Decentralized (Mesh) • Complexity--, Freedom++
Why things are how they are • A bit of a reach – might not make it here • Modern networking • Software defined networks (SDN) • Content Delivery Networks (CDN) • Cellular Networks • Domain Name Service (DNS) • Debugging tools: Dig/traceroute/whois
Not a Course Goal To learn IT job skills • How to configure specific equipment or technologies • e.g., Cisco certifications, • Technical whack-a-mole • But course material is relevant, and we use hands-on tools • Hopefully you’ll be able to use these tools to build stuff at the end of class
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